Laas. After briefly exchanging insults, we'd just leave each other alone and go about our business.

Lore is annoying on top of being a jerk and never runs out of energy.
The Borg Queen might try and seduce me since assimilation isn't an option
A Kelvan would just go on and on and on about how superior they are and how screwed my race is.
Q's brat would probably steal my clothes and throw me into a hellish scenario for his sick twisted amusement.

I totally love the notes about that episode which state, among other things, that J.G. Hertzler derived Laas' method of speaking from William Shatner, also the note about "And then the Swedish guy comes in..."